My lifetime service will now expire on May 31st, 2020. I got my lifetime service after I paid $30 to become an early adopter.
I am wondering if Oracle will issue refunds for us lifetime service users.
Lifetime can mean only the lifetime of a service, not the lifetime of the user. So no, you will not get any refund, because the lifetime is over, the service is dying. Be happy to have survived the service.